Also, the newline characters don't work right for me, they just display as a tiny square. I don't know if this may cause any issues but I installed codeblocks RC1 over top of my old one (final-beta 7).
AH HAH!
OK, first of all, purge your codeblocks directory. (If you have your projects inside it, then it's an "uh-oh", because that's normally a wrong behavior
)
Second, after installing CB, if it still doesn't work,
try disabling and-or enabling caching AND smartsense (I recall someone saying smartsense screwed up code completion). So, try with caching - smartsense both on, one on otherone off, etc until you try all the combinations.
Third - if you have caching enabled, purge the cache - might have become corrupted or something.
Hope that helps.