Of note - I successfully imported a full HD mxv file, so that appears to have been fixed as indicated below.
Changes in patch 31.0.1.13 compared to 31.0.0.10
• New Vita Solo Instruments available from the Store
• New Cherry Audio plug-ins available from the Store
• Improved support for activating Cherry Audio plug-ins
• Option for automatically increasing velocity
• Workflow improvements for audio and MIDI editing
• Crash fixes and bug fixes:
◦ Fixed crashes that occurred during MXV import
◦ Fixed waveform for mono wave files
◦ Fixed Live Pad and Beatbox crashes
◦ Waveform for mono wave files
◦ Revised localization issues
• Improved program interface
◦ Mixer
◦ In-app Store
◦ Loop manager
◦ File manager
◦ Beatbox
• Additional small-scale customization and enhancements within the program
Changes in patch 31.0.0.10 compared to 31.0.0.9
• Update Beatbox.vst3
• Adjustments to start screen design
Changes in patch 31.0.0.9 compared to 31.0.0.6
• Enhanced precision control
• Improved keyboard shortcut handling
• Minor in-app Store design adjustments