Rendered clips turned out to be not render after premiere pro update

Question

Hello guys,
I was using the old version of premiere pro for quite awhile, then my colleague told me to update it to the lastest to fix any bugs that exist.
so I updated my premiere pro to version 4.2.1.
After the update, I realised all the rendered files became not render. the timelines were all red and the program did not prompt for the rendered clips when I open the projects. For what I know, the rendered clips are still in the folder 'Adobe Premiere Pro Preview Files.'
I am really desperate for help as the amount of clips rendered is really a lot. I appreciate any help, thanks so much.

Answer 1

Welcome to the forum.
It sounds like the update might have separated the Render files from the Project's links.
Now, remember that Rendering is only necessary for the smoothest playback. You only have to Render, where you are working with critical aspects, like Keyframing Motion/Scale, or adding Effects. I complete many Projects, and never bother to Render, as I can see playback at a high enough level to do my editing. OTOH, there are often tiny segments, that might get Rendered many dozens of times - usually where Keyframing was done.
One can use the WAB (Work Area Bar) to just Render a small segment of the Timeline.
Now, why your existing Render files became un-Linked, I do not know that answer.
Good luck,
Hunt