I have heard this before but on MediaBrowser forums. It's something in the client - maybe i need to adjust something in the net35 version.
What i will do for now is absorb the error into the logfile so it won't popup a dialog.
I was already on top of that one (socket error) and have that solved for 0.12 which is due in a couple of hours from now. It happens randomly but i have clearly identified and fixed the cause. Hang in there
Added support for default profile, remember login, saving your prefered layout/view setting per context and several fixes.
More details and download link are at the top.
edit: i made a ninja-edit and added a new release because of a bug that prevented the list to expand beyond 50 items. The fixed version is: v0.12.5037.3547. If you downloaded the 0.12 installer before this edit please download the new installer.