Can't place images

[ginam69464841]

So, I've been using Photoshop for a while now, and suddenly I can't place images on top of backgrounds without them showing up very small. When I try to resize them, Photoshop lags out and the picture will disappear. I can put the image on top of another image, but even that has its limits. Ive asked my friends for help, but they don't know what to do.

[JJMack · Accepted solution]

If Photoshop suddenly start performing strangely try resetting your Photoshop Preferences.  A corrupt preference  file can cause some strange problems.   If I do a lot of Path editing suddenly adding a custom shape layer may take several minutes when normally it takes a second or two.  Resetting my Preferences restarting Photoshop will fix my problem. Corrupt preferences are so common Adobe added a startup shortcut to reset preferences and in newer versions of Photoshop added a button in Edit preferences to reset preferences next time you start Photoshop.