Invisible submarine...?

[Pistitom]

Hi, I have a strange problem, browsed the forum but didn't come across any similar issues....I cannot see either my sub, nor any other ships...they are simply invisible...sometimes ( on bridge ) these black and coloured flashing "things" appear, sometimes the whole screen goes black...otherwise no problem at all, reasonable fps, everything's fine...what could be the problem? The ships' textures? I have SH3 with GWX3, there are no such problems ( except lower fps when on bridge). Please, does anybody have any idea what this means? Thanks a lot in advance, and good hunting...