Default [Q] LG G2 gmail a

Hi,

My G2 (European) was recently updated to Kitkat and I am not sure if immediately after update it started to have this issue or its unrelated. Nevertheless, now if I try to open any file attached to a gmail message, I just get a black screen.

My friend has LG L9 II and just started to have the same problem a day ago. (He doesnt know if he has Kitkat or not.)

Any hints, what causes it?

Also, after Kitkat the phone started to freeze sometimes, it never did before. And of course, it wont play any more embedded Flash objects.

I am through already 10 smartphones at least, but NEVER had a single happy op.system update... unfortunately the G2 got also to be a worse phone than it was before.