I have a problem with GIMP in Ubuntu 14.04. When starting GIMP it works perfectly at first, but as soon as I copy a selection of pixels value in "system monitoring > resources > memory and swap history > memory" (hope those terms are correct, had to translate them) starts to increase and it doesn't stop until the memory reaches values bigger than 95%, which dramatically decreases the performance of my operating system. After closing GIMP the memory value suddenly decreases to some value below 30%. Something else I realized: as soon as the memory starts to increase, the cursor in GIMP changes to a busy cursor (or hourglass cursor or whatever it is called) for a very short period of time and this cursor change happens approximately once each second. I assume that GIMP is saving something each second, even though I don't actively save anything. I also assume that it has something to do with the clipboard since if I execute "xsel -bc" in a terminal, the memory increase stops (but does not reduce to its initial value).
Help would very much be appreciated!