Odd Behaviour with Glissando Lines
It took me a while to analyse what's actually happening here: I have created a score that, among other staves, contains an electric guitar TAB staff with a linked sub-octave treble clef staff. Every couple of bars there is a chord sliding into another chord two frets up via glissando lines. Enter the odd behaviour: Every time I make any (!) change to the score, be it an added or deleted note, or simply adding text or similar elements, one of the stacked glissando lines from a chord disappears and a stack of four diagonal glissando lines and four shorter, horizontal (glissando?) lines appears in a seemingly random position in the score, not linked with any note or rest. When I select one of the elements in the stack and delete it, the whole stack is erased.
I tried to reproduce this error in a fresh score but did not succeed.