The issues are as follows:
1. None of the fences in the main cities will open a dialogue with me to even sell them non-stolen merchandise.
2. None of the merchant booths set up in the Ragged Flagon will purchase stolen merchandise.
3. I cannot access the Thieves Guild Safe even though I am Guild Master.
Here is what I have done to try to resolve the problem:
1. I completed all quests related to the Thieves Guild, including side-quests to unlock each city and the caravan.
2. I have deleted Game Data and reinstalled with the latest patch.
3. I have waited 38 game-days (through the wait and sleep function) then saved, powered down, and reloaded.
4. I have limited the number of open quests so that I now only have four open quests (unrelated to TG).
None of my troubleshooting has resulted in removing this bug/glitch.
Also worth noting:
1. One of my open Quests is the College of Winterhold. Another open quest involves the Mysterious Gemstones I have gathered - could these quests be interfering?
2. I am unable to dispose of a few "Quest Items" even though there is no related Quest listed in my journal. These items include a Statue of Dil., Mystic Gloves, a Soul Gem, a greenish potion, and a few more I cannot remember) - could this be the root of the problem?
Basically, is there anything I can try that I haven't already?