I have studied my masters in a university but had dispute with them that I sent to OIA (for unis in UK). I had several issues in my thesis evaluation and supervision. However, the OIA replied that my complaint is not justified. The issue closed since then.
Now, there is a new professor in my X-Dept. which I find his research interests/publication match mine.
I am hesitating because of the previous issue with the dept. specially that the people that I complained against are still there including my supervisor/dept. head. I feel I will not be comfortable in terms of the research group as a whole, but this professor is the right one (professionally, as I have no clue about his personality). The university is high ranking one. Honestly, although I am totally convinced that my previous complaint was justified, I regret that I did it as I feel it damaged my relationship with the department.
If you are in my shoes, will you apply there in that uni. and research group again? Does universities admission accept applicants who made complaints against them? Do you think it is Ok or better to forget about this uni. and look for other options?