restart you PC into Safe Mode (hold the Shift key as you go through the restart sequence.
them run CC in there and see if that helps. that way there should be no browser related background task running causing CC to skip.
if that works, when you start the PC normally and CC tells you it has skipped things, it's probably because those programs and their related background processes are still running.
looking at Task Manager (Ctrl+Alt+Del) will confirm that.