I have this same problem with 11.0. Here's the strange part. I had some videos that were freezing up on on Nero Showtime but they would open just fine in Studio. I ran it through Handbrake and now it's the opposite: It will play like a champ in Nero Showtime but I now get "error opening video file" on the now-repaired video. Other videos in the same folder and the same format (MP4 to be exact) open just fine. The original corrupted video was MP4 so I preserved MP4 when I ran it. This has happened to two movies so far. Yes, they are full length 2 hour movies so maybe that's why?
Original file before running through Handbrake. The one that froze on Nero Showtime
Type: MP4
File Size: 1,054,379,185 bytes
Image Size: 1280 x 544
Pixel Depth: I don't even know what that meansFrame Rate: 23.98Source Audio Format: 48000 Hz - compressed - StereoProject Audio Format: 48000 Hz - 32 bit floating point - StereoTotal Duration: 02;04;41Average Data Rate: 999kbpsPixel Aspect Ratio: Unknown
AFTER running through Handbrake: Now plays all the way through on Nero
Type: MP4
File Size:
Image Size: 1278 x 544
Pixel Depth: I don't even know what that meansFrame Rate: 23.98Source Audio Format: 48000 Hz - compressed - StereoProject Audio Format: 48000 Hz - 32 bit floating point - StereoTotal Duration: 2:04:40Average Data Rate: 800kbps