Cursor Stays Active, Can't Move

[brethon]

Since yesterday only, it's occasionally occurred where I'll hit Esc to see the despawn window so I can see if I'm in RTB range, or MIA, or whatever my status is. I'll then click Cancel to keep playing, but the mouse cursor stays active even though the despawn box closes, and I can't move or interact with my vehicle or the game world at all. I try pressing left-Alt and then releasing to see if that will engage then dis-engage the cursor, but it doesn't change - the cursor stays visible and all I can do is desawn.

Seems random, I can't repeat it at will. Only consistent factor is it's only happened wile I've been using a Bofors so far.