I am a newcomer to PPro CS5.5 and have a very basic question.

When launching I am encountering difficulties in opening an existing project. Initially I am asked whether I want to open an existing project, a new project or help. Existing projects are listed. If I select either new project or help things happen as expected. So far so good.

However in the case of existing projects the program locates them OK but when I select one an error message advises - “File format not supported”. If I try to open it again the same thing happens. If then I try to restart my iMac I am asked the usual, am I sure I want to restart? If I continue with the restart I am then advised that PPro has cancelled restart. At this stage PPro opens even though the file format is not supported. What am I doing wrong? I am using a mixture of .MTS files from a Panasonic TM900 and .MOV files from a nanoFlash.

It might be that some application that you installed overwrote codecs or their settings. Try to reinstall Premiere, I think it should help.

Thanks Bart,

I have taken your advice and de-installed and re-installed PPro. I have also tried a series of mini projects and so far I have had no trouble opening or reopening any of them or in changing from one open project to another.

Thanks for the blog also, I trust I will not be examined on it.

I'm glad I could be of help. Good editing!