The letter 'R' from MText no longer showing completely

It seems recently sometime since the last few updates that the letter R has disappeared except for the diagonal part for the letter R:



This has affected all my old and new drawings.

Can anyone please help? I've included a test file:

http://www.filedropper.com/testr

It looks like the letter 'R' works for other fonts. The fonts Standard and Iso seem to be affected by this bug. I'll just replace all the font from my drawings with a new text and font as a work around.

testR.dxf

Thanks! We will debug this.