After having thought my problems were solved, they've only gotten worse.
After previously getting help on another topic, I have successfully created my first room fully textured. Now, I'm working on another room but when I try to adjust the Axis on planar mapping I always get this error:
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For some strange reason, Maya just all of a sudden decided it doesn't want to let me use any of the options in planar mapping and just gives me this error everytime. I tried going into the Temp folder and adjusting the properties and ticking "Read only" off, which worked for a while but now it's not..
Just realized something, I didn't see the Technical Issues forum. Sorry about that!