I have not tried the alpha, but restarted BTT at least a few times, but issue is still there.
If the clipboard manager is active and I'm copying something in Excel, the Excel application will not be responsive for a few seconds. This is not happening in any other application. As well, Excel is working fine again if I stop BTT.
Thanks Andreas, unchecking "Disabling MS Office ..." has not helped, so I disabled the clipboard manager for Excel. This helped, but of course is then not any more able to use the functionality.