Voukoder stopped functioning after changing HEVC Format

I was rendering a video in Vegas Pro 23 with Voukoder using lossless HEVC with the yuv420p format, and it worked fine as usual. Then I changed it to yuv444p and the encoder crashed and won't start working again even when I switch back to yuv420p. This is what the log file says:

2026-03-17 15:18:36 (info) [EncoderNode.cpp:387] Opening video encoder plugin 'libx265' with params '{"passes":1,"rc":3,"preset":"veryslow","profile":"main","x265-params":"lossless=1:open-gop=0:colorprim=bt709:transfer=bt709:colormatrix=bt709:range=limited"}'
2026-03-17 15:18:36 (error) [EncoderNode.cpp:396] Opening the encoder plugin failed with error code: -22
2026-03-17 15:18:36 (error) [Router.cpp:194] Open phase failed: -11
2026-03-17 15:18:36 (info) [VoukoderPro.cpp:650] Unable to open a Voukoder Pro session. Please check the log file.

Then when I try again, it thinks the license is still 'busy' from the last attempt and says:

2026-03-17 15:20:30 (info) [VoukoderPro.cpp:201] Validating license ...
2026-03-17 15:20:31 (info) [VoukoderPro.cpp:210] License is valid!
2026-03-17 15:20:31 (info) [VoukoderPro.cpp:211] Counting seat usage ...
2026-03-17 15:20:32 (info) [NetworkLicenseChecker.cpp:91] Active seats: 2 / 1 seats
2026-03-17 15:20:32 (error) [NetworkLicenseChecker.cpp:96] License is busy!
2026-03-17 15:20:32 (info) [VoukoderPro.cpp:650] Unable to open a Voukoder Pro session. Please check the log file.

Even if I use one of my older scenes that used to work or I change the settings or restart my computer, it continues to spit out these two errors and I can't use it anymore.

Edit: It suddenly decided to work for one render and then it stopped working again.