Invisible separators in TLB 4.4.8.1 beta

I was using the last official version (4.4) up to today, but have just updated to v.4.4.81. This appears to be working fine - and it's a really great piece of work - except that the plain separators are now invisible, and are detectable at all only as a narrow space between the particular buttons. Separators including a title do show quite a thick and prominent line, so they are working correctly - it's just the plain separators.

I'm using Win7 Home Premium with all the latest Windows updates.

This problem manifests both in the basic quick-launchbar version and in the standalone version. Any ideas about this?

Kind regards,

Well, just after I made my original post I was fiddling around with some TLB settings, and found that I got my spacer lines restored if I set Menu Appearance > Menu Options > Titles align: to Centre (it was previously set to Left).

That means that I have my temporary workaround, and of course it also helps point to the nature of the bug that is involved. I hope this report will be found helpful.