Over the last couple of weeks, every time I have tried to load any games that I wanted to play, all I've gotten is a white screen - and this when flash is enabled. They worked fine until recently, and it's not an issue with my computer (I've checked thoroughly) - can I have some help please?

[If it helps, the main games I have been trying to play are Plazma Burst 2, Pokemon Tower Defence and City Siege]