Not sure if this log is still valid in newer versions of Realband but you could check C:\Realband\RBERROR.LOG. The error may be listed in there.
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Steve

BIAB/RB 2022, Pro Tools 2020, Korg N5, JBL LSR 4328 Powered Monitors, AKG/Shure Mics.
PC: Win11 PRO, 4 TB M2 SSD, 2 TB HD, 128 GB Memory