Suddenly no H264 video (v0.5a or v0.6d on Win10)

My MiniTiouner had been working perfectly with H264 video on DVB-S using v0.5a through early March. I recently tried to test H.264 with Portsdown using DATV-Express as modulator and discovered H264 is no longer displaying video on MiniTiouner on Win10?
* Mpeg-2 - video displays correctly
* H264 - displays an error message "no video or bad CODEC/PID"
* H265 - video displays correctly
These results are the same using Portsdown/DATV-Express or using DATV-Express board by itself on Windows10.
I reinstalled v0.5a and also installed the newer v0.6d with no improvement.

DATV-Express v1.23 DVB-S transmission using H.264 displays MiniTioune error "no Video or bad CODECs/PID"
The GRAPH indicator is green and I get the same results with LAV codecs or using MS codecs.
Also, MiniTioune can record a GOOD TS file with H.264 transmission that plays OK video on Window Media Player.
Are there any suggestions on the cause of this problem on my 32-bit Win10 notebook?...de Ken W6HHC
* Mpeg-2 - video displays correctly
* H264 - displays an error message "no video or bad CODEC/PID"
* H265 - video displays correctly
These results are the same using Portsdown/DATV-Express or using DATV-Express board by itself on Windows10.
I reinstalled v0.5a and also installed the newer v0.6d with no improvement.

DATV-Express v1.23 DVB-S transmission using H.264 displays MiniTioune error "no Video or bad CODECs/PID"
The GRAPH indicator is green and I get the same results with LAV codecs or using MS codecs.
Also, MiniTioune can record a GOOD TS file with H.264 transmission that plays OK video on Window Media Player.
Are there any suggestions on the cause of this problem on my 32-bit Win10 notebook?...de Ken W6HHC