I'm having the same issue: picolog is crashing when I try to save as CSV or TXT file. However, it's not all the time. I have two different PLW files, one "small" (9.6MB), one "large" (28MB). The small file exports without an issue; the large file crashes picolog every time. I've tried on two computers, XP and Windows 7...same thing on each machine. I'm using an ADC20, and the latest version of the software tools (r5_21_9).
I would send the file, but below you ask not to send a large file; is there an ftp site I can upload the file to so that you can try it? The large file has 1,000,000 sample points...the reported upper limit.