I recorded some clips on the internet through the sound card with
Audacity. I exported the recording as a wave file, and burnt it
to a CD. The problem is when I play it back with KsCD it won't
stop playing. It comes to the end and just repeats the last fraction
of a second over and over.

I used K3b to burn other audio CDs that I copied and didn't have
a problem with KsCD playing them. Is this a problem with Audacity,
KsCD or did I do something wrong?
I recorded the file; saved project and then exported as a wave file
to burn.

Thanks

The CD specifications says that the length of your tracks should conform to the 1/75th of a second break points. SBE stuff. There's a label track that lets you truncate to spec in audacity. But it's a PITB to use. Or just use the project toolbar to set your segment lengths to even seconds.

If I don't adhere to that and burn to 700MB media, instead of 650MB, my standalone player wont even play the discs. Even though it will play it if burned to 650MB discs, or mini-discs.

Where did you get information on that? I couldn't find anything
in the Audacity manual. I'm new to sound editing, and am not
familiar with this.

I recorded the clips together as one track. It is 52 min 33.something seconds.
I shortened it to 52 min and 32 seconds. It didn't change anything. Am I understanding this right?

Thanks

It's a CD thing. Check the manpage for cdrecord / wodim / cdrdao / ..... You'll see a reference to an index being a multiple of 1/75th of a second.