Create a fresh browser profile without extensions, or use . Try Mice Crush 5 there. If the error disappears, re-enable extensions one by one. Known culprits:
No. Fix.35 had unbroken it.
"Connection lost. Crushworld-Net Mice Crush 5 encountered an unexpected state. Code: Fix.35. Please clear cache or reinstall game data." Crushworld-Net Mice Crush 5 Fix.35