"Content in post not permitted" Errors: What to do

If you try to include characters in certain foreign languages in your post, you may find it impossible to submit it, getting the red box and error message shown below, with Korean as the example:

The way around this is to take a screen shot of problematic characters and include that in your post instead of the actual text.

In addition to Korean, you will encounter this problem with these languages of India: Hindi (and several others that use the Devanagari script), Assamese, Malayalam, Kannada, Gujarati, Bangla, Odia, Punjabi, Tamil, and Telugu. If anyone finds more, please mention it in a comment to this post.

In the Korean case, there is an Apple Support Community in that language where you can post without any problems.