Has anyone got an idea why that would happen?
btw: I find it extremely slow when i want to display a set of 25+ pictures. I read that this could be solved by enabling the caching time...which amout of time should i type in?
Could you please contact me by email, so we can see if we can resolve this issue. This might help development and other users as well.
The plug-in is indeed quite slow upon displaying a set of pictures for the first time. Unfortunately this is due to the lack of speed of the flickr API, so I can't do much about that. Enabling caching should resolve that issue for the time the results in the cache are valid. By default the cached results are valid for 24 hours (86400 seconds). You can change the cache settings in the basic options of the plug-in.