Hello,
I had the same problem until today, on windows 7 and the new versions after june did not correct it.
Without mods it worked, so I tried to deactivate some. For me it solved the problem to deactivate YasenKrazen + aslain "load wheel". I don't know which one is the faulty but after this no problems any more ; ) And I still have XVM and other mods.
Hope it helps !