DPP 4.7.20 installs, runs once, won't run again

[cjjthomp]

I upgraded from DPP 4.3 to DPP 4.7.20 yesterday, opened it today and converted about 100 raws to JPEG then closed it.

Now when I try to open it, all I get is a black panel with the title "Digital Photo Professional ver.4".

I've tried re-installing, no luck.

I uninstalled all the Canon utilities and installed only DPP - still no luck.

I'm running Windows 10 64-bit.

Anyone else in the same boat?

Thanks,

Jeff

Calgary, Canada

[Ray-uk]

That's great, just a pity that it was such a long procedure to get it going again.

At least it's a huge relief to know that you haven't got to re-install Windows

[PaulSoebekti]

Thank you Ray.

Your suggestion saved my day, today!

Merry Christmas.

Paul

[richrd0001]

This worked for me. Thank you very much!!!  This fixed the problem of failure to start.

[richrd0001]

This solved my failure to start problem but I have another problem.

Before I even got to the problem of the program not starting I got a message that I needed to change the display size before the program would launch. I reduced the text size to 100% and then got DPP to sort of start but then it would disappear. The failure to start problem was solved by this fix here as I said but I still have this display size problem. I changed the display size back to 150% but the app would not lauch. The same display size error message appears and no start.