I received the Dainty Sload quest fine and dandy. The map marker to "Speak with Erikur" leads me to the ocean slightly NE of The Katariah. Once there a map marker directs me to a nifty wooden pair of doors in the base of the mountain that takes me into Solitude....then the Marker takes me back to the ocean....then repeat. I tried going to Erikur's house and waiting various times, but I still can't find him. Long story short....if this is a bug, are you saying I can NOT ever finish the restore the thieves guild? If so that is sad, I understand quest bugs here and there but, a bug that shuts you out of a huge chunk of quests....not fair.

Apparently this isn't just me. I tried finding a solution online and UESP has been a reliable resource for me in the past....
They summed it up with a BUG! Check it out for yourself...
USEPWiki, search Erikur, then scroll down a little bit under Bug.

I hope it is just me.....please someone, anyone, help!!!

erikur can be found at the blue palace for this quest.
If he is not there...
it is prolly a huge bug then.

Nope, not in the Blue Palace! After some more research, I found him In the water at the map marker location, BUT he was UNDER Solitude.

Here is how you get under Solitude...

Once in Solitude, find the Radiant Raiment. stand facing East with the Radiant Raiment on your right. You will see ramps heading up toward the Fletcher/Forge directly in front of you. Proceed forward toward the ramps, head up the first one, then up the second one, stopping at the top of the second ramp. Walk forward a few steps, you should be against the wall your left. Turn left facing West looking at the roof/windows of Angeline's Aromatics. Jump up onto the wall and then down onto Angeline's lower roof. Walk around to the front corner of her roof. Turn and face North looking up the slope of her roof. Make your way up this steeper roof onto the smaller roof sticking out to the South. To climb this steep roof, move side to side while spamming the jump button. Once onto the smaller roof, turn and face South looking at the smaller roof above the door to Bits and Pieces. Equip Whirlwind Sprint, aim for the center of that roof above Bits and Pieces door, and Whirlwind Sprint over to that rooftop. Now on the roof of Bits and Pieces, turn and face West. Being careful to not fall off, walk West to the end of this roof section, peek around the corner and down to your left/South at the other lower roof of Bits and Pieces. Jump down onto that roof. Stop and face East, walk East until you are walking directly into the stone wall, stop and turn right/South facing a gap between the wall on your left/East and a peaked roof on your right/West. Walk forward into that gap, and you will fall through Bits and Pieces, and underneath Solitude. To navigate down the steep Cliffside, walk North until you walk right into the Cliffside, turn and face East you will see a crevice type thing, that slopes steeply down the side of the mountain. Slowly walk down the crevice to the bottom. Follow your map marker to Erikur standing in the middle of the ocean.

It worked! I am on my way to restoring the Thieves Guild once again!

Hope this helps anyone in the future!

Now THAT is some determined quest progression right there gratz.