IDE v.1.5.2 - board not found

Sorry if this has been brought up before - couldn't find it via forum or google search. It may be buried somewheres in the gazillion online pages on Arduino.

I've been using IDE v.1.0 ... v.1.0.5 in the past successfully [WinXP machine], and have my custom mega1284 board info located in the sketch folder in subdirectory \hardware. However, I just installed IDE v.1.5.2, and my board does not show up in the "Tools > Boards" menu. It shows up fine in all the other IDE versions. DUH .... ??

Note that the libraries that are stored in sketch folder subdirectory \libraries do show up ok in v.1.5.2.

Another question - is there better support in v.1.5.x for 1284 chips, or am I going to have to go in and patch a bunch of library/etc files, like I had to do with v.1.0.5?