'Under New Management' is the final quest of the Thieves Guild questline. It is acquired by completing Darkness Returns and all four 'Special Jobs' given out by Delvin Malory.

You only acquire those special jobs by completing at least Five jobs for either Vex or Delvin in each of the Cities they offer (Bar Rften. They give you jobs for Riften from time to time. But there is no further Quest for that).

Having completed the special jobs in Whiterun, Windhelm and Solitude, I now need to acquire 'Silver Lining' the final job based out of Markarth.

The only problem is... I cannot seem to get Delvin or Vex to give me any jobs in Markarth any more. To date I have done Two. But whenever speaking to either, for any kind of Job, they only ever seem to give me jobs at the Cities I've already siezed. And Riften.

Seriously, last night I saved the game before talking to Delvin or Vex and reloaded every time that one of them didn't give me a job based out of Markarth.

After 38 attempts I gave up for the night.

Not one job offered in Markarth.

Technically, I know, it's a 1 in 5 chance. But for some reason irt's just not happening.

I have completed every other task I can think of for the Thieves Guild. All main quests until the end of Darkness Returns, the other 3 City Jobs, contacting the Khajiit caravan for Tomilia. I just don't know what's going wrong.

Without completing 3 more Jobs in Markarth, and finishing this quest, I cannot complete the questline or get the achievement for it. It's getting frustrating.

Do you have the same problem if you don't reload, but instead talk to Delvin/Vex and say you don't want to do that quest any more? I don't think there is a consequence for rejecting jobs (even though Delvin/Vex say they are getting annoyed). I did consider that reloading could be affecting the games random number generator in such a way, that for some reason, you don't get a Markarth job (I do realise I am clutching a straws here, because if the random number generator is truly reset back to its original value after reloading, then I would expect you to get the same quest each time). However, without knowing the games mechanics, I thought it would be interesting to see if anything is different if you didn't reload, but instead tried 'rejecting' jobs after they were accepted. Hopefully, something will be different enough to allow you to progress the thieves guild questline.