Quote: PD 10 works fine now that I have upgraded my PC (see profile)
But when I try upload to Youtube the program crashes and immediately closes. I have tried various tweeks on the PC, but to no avail.
Anyone else had this problem?

Yes, we have all had that problem one time or another.

The best advice is you produce a video on your computer and then use the Youtube upload in your account.

There are several WMV profiles that are good of uploading to Youtube.
Windows Video 9 Full HD quality (1920x1080) is the full HD profile.

Windows Video 9 HD Standard Quality is the 1280x720 profile. It may be too low bit rate. The default profile in PD 9 is only 6 Mbps.
It may be better in PD10. (You should have 8 Mbps at least).

You can use other profiles of your choice for Youtube upload, WMV produces smaller videos to upload.

I have used MP4, M2TS and WMV.

Carl312: Windows 10 64-bit 8 GB RAM,AMD Phenom II X4 965 3.4 GHz,ATI Radeon HD 5770 1GB,240GB SSD,two 1TB HDs.