Ok, first try to update to last revision (currently it is Miranda NG 0.95.7 alpha build #18632 (e41a97b)). It contains some fixes.
Second, please check in Message sessions options (Options -> Message Sessions -> Message log -> Global Message Log Display), which plugin you use for message sessions log. Internal TabSRMM's message log is
broken now. So try to set History++ as message sessions log.
Downgrade TabSRMM is bad idea because old plugin build with VS2010 and new Miranda - with VS2017. Compatibility is not guaranteed