I'm glad you were able to get this worked out a bit. I have had one catheter move up and hit my diaphragm, causing me to have the hiccups for three days straight! ARGH! I jumped around in frustration and was finally able to get it to go back down. One catheter became all tangled up in adhesions in my belly and eventually had to be replaced. One thing I have noticed while on PD is that having sex often causes my tube to migrate and not work as well for a few days. !! I have to jump around to get it to fall back down.
Apart from it may be your catheter moving , it could also be fibrin , alot of people seem to get it and find it blocks the draining out , have you checked your bag after draining to see if any is in there ?