Hi everyone, after getting some hints from you about the possible cause of this error, I have been able to fix my project and I'd like to give you back my insights... First, I uploaded the project file in the Windows Editor. By comparing the file to an earlier backup version which worked fine, I found the following: At one point in time PE10 corrupts the .prel file by inserting "," in decimal numbers instead of the required "." for the <StartKeyframe> as well as for the <Keyframes> tags. The correct syntax of both these tags seems to be as follows: <StartKeyframe>-xxxx,yyyy,0,0,z.,z.,z.,z.</StartKeyframe> <Keyframes>-xxxx,yyyy,0,0,z.,z.,z.,z.</Keyframes> xxxx is a 17 digit (integer) number yyyy is either a (decimal) number z. or a range z.:z. or a boolean value (true or false) z. is a decimal number (number followed by a ".") In my corrupted .prel file, all numbers which were supposed to be "z." were actually "z," which caused the error. Only some of the occurrences of this error can be captured by the script described above, namely replacing the "," followed by 12 or 24 "0" with a ".". Unfortunately, there are a lot of other occurencences which have to be dealt with in order to correct the .prel file. One can get a number of algorithms for speeding up the process of replacing the erroneous "," with ".", e.g. search for ",000000" and replace it by ".000000"  (similar to the scipt above) but you also have to consider  search for ",," and replace it by ".," search for "0,5" and replace it by "0.5", search for ",<" and replace it by ".<  etc., you get the idea.... This list is not complete, you still have to search manually for some odd numbers!! However, as you progress with replacing the erroneous "," you will see the perceantage of the .prel file loading successfully increase and at the end of the day (more an hour really) the file will load completely. I have not tried to fully automate the process. Hope this was a one time effort! The above procedure is a pain in the neck, but if your son has spent an entire weekend on a project it is worth the effort! Hope this will work for you as well. Adobe should be able to fix this easily. Good luck! Best regards, Rainer ... Ver mais