Clive R. Haynes FRPS
This next 'Preference' setting has become a matter of some debate. However, the settings you choose will not in necessarily be a problem, it's merely a matter of 'opinion' amongst the more technically minded
Memory & Image Cache
Cache: this setting defaults to '4', however 'received wisdom' suggests that setting the level to either 6 or 8 can improve the stability of the program - try it and see the setting operates on your system. If you're doubtful, go back and reset it.
The other opinion is that Photoshop is unable to take advantage of RAM amounts above 500mb or so if you have 1gb of RAM then 50% is probably OK.
final setting on the Preferences list is 'Type'.
And finaly, in order to preserve these 'Preferences' and to retain the way in which you like Photoshop to 'open' and/or be reset, click on the 'Workspace' link below.