Text rotating to match ucs

[matthew.221135]

i am having this issue with text in the editor rotating to match WCS all the time
this occurs with text, MText and multileaders
if i leave the UCS set to world and the text horizontal it is normal, but the moment i rotate the text or change to a user coordinate system the text appears as such when editing , sometimes even when creating new entities.
if editing MText or multileaders, i can select "always display WYSIWYG" from the editor settings and it appears fine for the remainader of that editing session, but need to toggle again for the next session.
i have tried all different settings for MTEXTFIXED, currently set at 1.
I have repaired and reinstalled the installation, am currently running version 2018.1.1 with all known updates although this issue was occurring in 2016 (never tried 2017, too many other issues to use that release)
refer attached image

Note, it doesnt do it on all drawings, but once it does it won't stop and i have found no particular trigger to make it start.

[matthew.221135]

I have isolated the problem to a customised toolbar i created. whenever i include it in the customised workspace i get the problem, if i exclude it there is no problem.