No problems but...
I haven't been having any problems recently, but back when it was with the other guy I had some issues the same as yours; wouldn't upload. Long story short; the actual programmer of kitlog insisted that the problem was my end [it was] but was wrong about the specific details. After getting down and dirty with some registry monitoring tools I was able to correct the programmer as to how his own program works. I fixed my problem, but have no idea whether they wrote a 'fix' for how it occurred in the first place. I won't go into the details since my issue likely wouldn't affect most home users. Unless you use a proxy server and recently changed it that is!
What was my point again? Oh yes, if you post more specific details of your problem then maybe, just maybe, someone here might have seen it before or be able to help you work it out. There's some clever guys on these forums...