I have done a fresh Win7 Ultimate RTM install which went fairly smoothly and moved my old Vista recordings over to the new install.

 For some reason, any new recordings post Vista do not show their thumbnail pictures, just a blue box with a little buzz graphic in it, the old Vista recordings are fine though.

 Taking a closer look in the folder, the new recordings seem to have a different look too (not at home so cannot see if the file extentions are the same but I remember the icons being very different).

Any help would be great, thanks.

W7 records TV in the new .WTV format.

 I've noticed that the thumbnails don't appear right away when there are a lot of shows. Maybe you just didn't wait enough?

 Bye.   

 Yes I am aware that Windows 7 records in a slightly different format. If you had read my post correctly then you would note that the Vista recorded TV thumbnails are showing up fine

 Does anybody have any useful hints at why the thumbnail won't show up please?

I understood your original posting just fine. I was pointing out that when there are a lot of recordings, the newly introduced ones may be slow in showing their thumbnails, whether MC7 or MCV.

I recently improved my home network and could now add the recordings of each HTPC running MC7 to each other machine by adding each recorded TV folder to each other media library. When over 100 recordings suddenly showed up on this one machine, all the new thumbnails were missing. It took a while before they showed properly. I will ask again, did you wait some time, like maybe even as much as 30 minutes, or more, for the new thumbnails to show? I finally had to reboot that one machine to get it to show right.

Bye.  

 Yes I waited, as I have done with every media centre I have had, over an hour.

I had no trouble with Vista at all, something seems to be amiss with Windows 7 and the new format somewhere. There is no thumbs.db file to delete either, so the thumbnail database can't be reset that way. Also, in the recorded TV folder in Windows (not media centre) the thumbnails are still not showing but the ones I moved from Vista are showing fine.

Looking for a solution.

You can get rid of existing tv thumbails by deleting the TVThumb.db file found in C:\ProgramData\Microsoft\eHome\thmb

You either need to end the ehvid.exe task - and possibly some other eh* services, or just start up in safe mode.

The next time you go to recorded tv, the thumbnails will get rebuilt.

I occasionaly get one or two shows without thumbnails, I haven't been able to find any obvious pattern to it yet......

 I had a look in the thmb folder and there was no tvthumb.db file! I deleted what was in there and the old Vista thumbs built up again but not the wtv Win 7 thumbs.

 Still no tvthumbs.db file appeared though. 

Do you have hidden / system files showing?

I should have said that the file is hidden!

 Yes, checked all that - showing all files is the first thing I do on a fresh install

 Definitely just the .wtv files that are not showing thumbnails. I have one codec pack installed (Sharks) and nothing else that may/may not interfere.

 Very frustrating!

 OK I have found the solution to this and tested it fully, now all is working as it should be.

 The Microsoft MPEG2 codec file had somehow become unstable - I have no idea how or why but I replaced the file msmpeg2vdec.dll and all was well.

 Took a bit of tracking down but all seems well now.

Guys....I have this problem as well.  My thumbnails are not showing up in Recorded TV in Windows 7 RTM.  I read this is probably due to the fact I'm using the Powerdvd 9 decoders.

 Anyone know a registry hack to get around this?  I really don't want to give up the Powerdvd decoders because they are WAY WAY better than the Microsoft default ones.  It's not even close.

I also use the powerdvd codecs to fix some issues I had with certain TV channels. Hopefully someone has the answer on how to get TV thumbs showing correctly when not using the microsoft codec.

 How did u re-install the msmpeg2vdec.dl? 

Is there any update to this? I have Win 7 Ultimate recording WTV files fine.. Just no Thumbnails at all.. I tried re-registering the dll file and that didn't do a thing either. Any ideas? Thanks Josh