I haven't seen this issue. Checking further, it appears that my .bvu file names do have spaces, but they also have a comma character between each of the the window names.

My experience was that the suggested file name is already entered by the program, based on the views that have been selected on screen:
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Suggestion: try return to factory defaults?


BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.