[I am VERY new to dominators, looking for an Earth Con./Dark Assault build]

Without knowing your preferred powers, loathed powers, etc, it's hard to be specific, but here is one example of an end-game (read: expensive) build that hits some big Dominator care-abouts: perma-Dom, perma-Hasten, multiple damage bonuses, and an AoE control (Stalagmites) that can be maintained indefinitely with Domination and/or Gather Shadows.

 

Soul may not be the most flashy or OMGCOSMICPOWER epic choice, but it's nicely thematic and lets you stack to-hit debuffs.

 

Troglobite, Earth Control/Dark Assault/Soul Mastery dominator

 

Villain Plan by Mids' Reborn : Hero Designer 2.6.0.1
https://github.com/ImaginaryDevelopment/imaginary-hero-designer

Click this DataLink to open the build!

Troglobite: Level 50 Mutation Dominator
Primary Power Set: Earth Control
Secondary Power Set: Dark Assault
Power Pool: Speed
Power Pool: Fighting
Power Pool: Concealment
Power Pool: Leaping
Ancillary Pool: Soul Mastery

Villain Profile:
Level 1: Fossilize

• (A) Basilisk's Gaze - Accuracy/Hold
• (3) Basilisk's Gaze - Recharge/Hold
• (3) Basilisk's Gaze - Endurance/Recharge/Hold
• (5) Basilisk's Gaze - Accuracy/Endurance/Recharge/Hold
  

Level 1: Dark Blast

• (A) Entropic Chaos - Accuracy/Damage
• (5) Entropic Chaos - Damage/Endurance
• (7) Entropic Chaos - Damage/Recharge
• (7) Entropic Chaos - Damage/Endurance/Recharge
• (9) Entropic Chaos - Chance of Heal Self
  

Level 2: Smite

• (A) Superior Blistering Cold - Accuracy/Damage
• (9) Superior Blistering Cold - Accuracy/Damage/Endurance
• (11) Superior Blistering Cold - Accuracy/Damage/Recharge
• (11) Superior Blistering Cold - Damage/Endurance/Accuracy/RechargeTime
• (13) Superior Blistering Cold - Recharge/Chance for Hold
  

Level 4: Gloom

• (A) Entropic Chaos - Accuracy/Damage
• (13) Entropic Chaos - Damage/Endurance
• (15) Entropic Chaos - Damage/Recharge
• (15) Entropic Chaos - Damage/Endurance/Recharge
• (17) Entropic Chaos - Chance of Heal Self
  

Level 6: Quicksand

• (A) Tempered Readiness - Endurance/Recharge/Slow
  

Level 8: Stone Cages

• (A) Superior Ascendency of the Dominator - Accuracy/Confused/Hold/Immobilize/Sleep/Stun/Terrorized
• (17) Superior Ascendency of the Dominator - Confused/Hold/Immobilize/Sleep/Stun/Terrorized/Recharge
• (19) Superior Ascendency of the Dominator - Endurance/Recharge
• (19) Superior Ascendency of the Dominator - Accuracy/Confused/Hold/Immobilize/Sleep/Stun/Terrorized/Endurance
• (21) Superior Ascendency of the Dominator - Accuracy/Confused/Hold/Immobilize/Sleep/Stun/Terrorized/Endurance/Recharge
• (50) Superior Ascendency of the Dominator - Recharge/Chance for +Damage
  

Level 10: Super Speed

• (A) Celerity - +Stealth
  

Level 12: Stalagmites

• (A) Absolute Amazement - Stun
• (21) Absolute Amazement - Accuracy/Stun/Recharge
• (23) Absolute Amazement - Accuracy/Recharge
• (23) Absolute Amazement - Endurance/Stun
• (25) Absolute Amazement - Chance for ToHit Debuff
  

Level 14: Night Fall

• (A) Positron's Blast - Accuracy/Damage
• (25) Positron's Blast - Damage/Recharge
• (27) Positron's Blast - Damage/Range
• (27) Positron's Blast - Accuracy/Damage/Endurance
• (29) Positron's Blast - Chance of Damage(Energy)
  

Level 16: Gather Shadows

• (A) Recharge Reduction IO
• (29) Recharge Reduction IO
  

Level 18: Earthquake

• (A) Dark Watcher's Despair - To Hit Debuff
• (31) Dark Watcher's Despair - To Hit Debuff/Recharge
• (31) Dark Watcher's Despair - To Hit Debuff/Recharge/Endurance
• (31) Dark Watcher's Despair - Recharge/Endurance
  

Level 20: Engulfing Darkness

• (A) Armageddon - Damage
• (33) Armageddon - Accuracy/Damage/Recharge
• (33) Armageddon - Accuracy/Recharge
• (33) Armageddon - Damage/Endurance
• (34) Armageddon - Chance for Fire Damage
  

Level 22: Hasten

• (A) Recharge Reduction IO
• (34) Recharge Reduction IO
  

Level 24: Boxing

• (A) Accuracy IO
  

Level 26: Volcanic Gasses

• (A) Gladiator's Net - Accuracy/Hold
• (34) Gladiator's Net - Recharge/Hold
• (36) Gladiator's Net - Endurance/Recharge/Hold
• (36) Gladiator's Net - Accuracy/Endurance/Recharge/Hold
• (36) Gladiator's Net - Chance of Damage(Lethal)
  

Level 28: Grant Invisibility

• (A) Luck of the Gambler - Defense/Increased Global Recharge Speed
  

Level 30: Tough

• (A) Steadfast Protection - Resistance/+Def 3%
• (37) Gladiator's Armor - End/Resist
• (39) Gladiator's Armor - TP Protection +3% Def (All)
  

Level 32: Animate Stone

• (A) Sovereign Right - Resistance Bonus
• (39) Expedient Reinforcement - Accuracy/Damage
• (39) Expedient Reinforcement - Damage/Endurance
• (40) Expedient Reinforcement - Accuracy/Damage/Recharge
• (40) Expedient Reinforcement - Resist Bonus Aura for Pets
• (40) Blood Mandate - Accuracy/Damage/Endurance
  

Level 35: Dark Embrace

• (A) Gladiator's Armor - Resistance
• (42) Gladiator's Armor - Resistance/Rech/End
• (42) Gladiator's Armor - End/Resist
  

Level 38: Midnight Grasp

• (A) Hecatomb - Damage
• (42) Hecatomb - Accuracy/Damage/Recharge
• (43) Hecatomb - Accuracy/Recharge
• (43) Hecatomb - Damage/Endurance
• (43) Hecatomb - Chance of Damage(Negative)
  

Level 41: Dark Obliteration

• (A) Ragnarok - Damage
• (45) Ragnarok - Accuracy/Damage/Recharge
• (45) Ragnarok - Accuracy/Recharge
• (45) Ragnarok - Damage/Endurance
• (46) Ragnarok - Chance for Knockdown
  

Level 44: Soul Drain

• (A) Obliteration - Damage
• (46) Obliteration - Accuracy/Recharge
• (46) Obliteration - Damage/Recharge
• (48) Obliteration - Accuracy/Damage/Recharge
• (48) Obliteration - Accuracy/Damage/Endurance/Recharge
• (50) Obliteration - Chance for Smashing Damage
  

Level 47: Weave

• (A) Luck of the Gambler - Defense/Endurance
• (48) Luck of the Gambler - Defense/Endurance/Recharge
• (50) Luck of the Gambler - Defense/Increased Global Recharge Speed
  

Level 49: Combat Jumping

• (A) Luck of the Gambler - Defense/Increased Global Recharge Speed
  

Level 1: Brawl

• (A) Empty
  

Level 1: Domination

Level 1: Prestige Power Dash

[Pine's Hero Designer 2.22]

Having issues importing data chunks as well.

Would you be so kind as to describe the issue?

Pine's v2.22 (have not tested the beta update) simply does nothing when you try to import a build (where "build" is a data chunk copied to the clipboard). This applies even to data chunks produced in v2.22.