It was fine when I launched the application, but when I Drag&Drop Photo to the window, an error window occured. [Free diskspace below 500MB...]

This also happens when I right-click on photo,and open it whtih PSPrp X4.
Then,if I try to add any effect, another error window occured and the application closed. [Free diskspace below 300MB and closed...]

I checked preferences to change cache folder or temporary folder, but I found that cache folder has only 10MB files in it , and temp has 0MB.
It seems like that a hidden file(500MB+) taked the freespace.
If I purged my ramdisk(R:\ 2G free), error never happens.
[Question]
Can I change any setting to avoid this issue while I do have to use RAMDISK with freespace below 300M ? Sometimes, but not always below 300M. (exp. Change alert threshold to 100MB.
or
Can I move the PSProX4 temp file to other drivers? (But there is no such preference in the application, windows register can do it?
My desktop and laptop environment :


C: Windows, Applications (at least 10GB freespace )
R: Ramdisk with system temp,user temp in it. (4G/2G, and often has 1GB+ freespace)
Any help and advise you all can give me would be much appreciated!
Thanks so much.
