The other day I was disassembling my loop, and I was going to remove the fittings from my EK Supreme HF. But when I tried to unscrew the fittings, they were completely stuck. These were Bitspower compression fittings. No matter how hard I tried, they wouldn't budge. And I didn't really tighten them an awful lot when I installed them the first place either. I ended up having to use pliers to get the fittings loose, which in turn ruined the black finish on them. I couldn't see anything unusual with either the threads on the block it self or the fittings.

Anybody else experienced this? Do you think it is the block or the fittings that poses the problem? I didn't have any trouble removing the fittings from any of my other blocks. However, my CPU block is the only one with plexi. Could this be the issue?