Lightroom 4 import problems.
The import module of LR 4 created nearly every time I tried a crash and I was not able to import any photo from any device or even not from the desktop. Have spend the last three weeks to solve the problems without result.
Solution which finally worked for me:
I stopped the computer and removed all devices connected by USB. After that start the computer and LR4 import module worked 100%. After that I connected all hardware one by one and every time I started LR4 no problems where found. Now I have connected the same hardware as before, started the computer and LR 4 various times but no problems more with the import module.