Videostudio Pro 2019 Crashing with Transitions

[regkaz]

I've been making videos from my Canon VIXIA HF R800 with no problem. I took several movies on vacation with my Panasonic DC-ZS70. If I use any transitions the Panasonic movies will make Videostudio crash and the log file reports:


Faulting application name: vstudio.exe, version: 22.3.0.436, time stamp: 0x5cdcc8a2
Faulting module name: ulmp4lib.dll, version: 22.3.0.436, time stamp: 0x5cd12863
Exception code: 0xc0000005
Fault offset: 0x0000000000077175
Faulting process id: 0x3d0c
Faulting application start time: 0x01d5822c73cc5abb
Faulting application path: C:\Program Files\Corel\Corel VideoStudio 2019\vstudio.exe
Faulting module path: C:\Program Files\Corel\Corel VideoStudio 2019\ulmp4lib.dll
Report Id: 1d3800b0-bcbf-4037-9222-ac3e325ebfb1
Faulting package full name:
Faulting package-relative application ID:

I tested the same files using an old copy of Vegas Pro 14 64 bit without a single problem. I tried rendering as
MPEG-4 Files
24 bits, 1920 x 1080, 30 fps
Frame-based
H.264 High Profile Video: 15000 Kbps, 16:9
48000 Hz, 16 Bit, Stereo
MPEG AAC Audio: 192 Kbps
with no hardware acceleration and with smart render both off and on with no joy. What should I check?

Specs:

Windows 10 Home 64 bit 1903
Zotac Nvidia GTX 1080 436.48
Ryzen 7 1700X
MSI X370 carbon Pro MB
32 GB ram
1 TB C drive (NVME Samsung)

Ric