For subscript or superscript in mtext, put a carat before or after the character then you can click on the stack icon.
If LT scaling is not the same in paperspace as in model space: 1. type LT, 2. expand to view details if necessary, 3. check box that says use paper space units for scaling.
To disable auto-stacking: 1. create fraction and let stack, 2. right click on it, 3. select stacking properties, 4. find the disable option
To fix upside-down dimensions: 1. type the following: UCS / world / plan / current, 2. adjust the UCS accordingly
How do I find out which version a drawing was saved in? [beta]
Open the AutoCad drawing file using Wordpad or other suitable text editor. The beginning of the file has the version info: