first of all many thanks! happy to have it working again (all the measurements... ) and this is/was the original file.
I sync my iMac with my macBook through Wuala. and the file on the macBook is corrupted too. maybe something went wrong while syncing? ...

but the file has 57 MB !!!!

<t>I worked on a file, saved it and now, 2 days later, while trying to open the file again, I get the error message " can not open file /user/.... fileName".<br/>
other files, which I created the same day can be opened perfectly. <br/>
version of SH3d: 3.7 / mac on an iMac with 10.7.5 / latest java ...