I've been using Arduino happily for almost a year, but in the last two days something happened to the IDE: The "Compiling sketch..." phase takes forever, full minutes for the simplest sketch. Verbose output suggests it doesn't get stuck on any particular step - just goes extremely slow overall.
This also happens on the Energia (arduino IDE clone for the TI MSP430 Launchpad), so I guess there are some definitions gone astray in the system, for gcc or whatever both of these use. I've also installed the files for the "Zigduino" and uploaded a program for it before trouble started, but that's on a separate Arduino IDE in a different folder.
I'm using Windows 7, 64-bit. Any suggestions or solutions would be most welcome, except formatting the PC because that's not an option right now...
Thank you very much in advance, Ido