I'm work on thwo different sites and two different purchased power store 4 and getting the same error on both.
I started over. deletted everything including the database. I loaded the zipped file to the sever (gator host) and unzipped it in the server. Ran the installation and all works except design -- saving a theme. The new theme is there but I'm getting the following error and no details are saved:
500 Internal Server Error
The request was not completed. The server met an unexpected condition.
188.8.131.52/~rmi25/PowerStore%20Files/webassist/plugins/styler/unload.php (port 80)
I tried setting all the permision along the path to 777 but that did not fix it.
I found the error reporting code in another post and added it to unload.php .
Ran thru the save theme in ie8, latest firefox, and latest chrome. All gave me the same error with no additional info.