VideoStudio :: X4 Crashes When Attempting Audio Editing?

I had been given Ulead VS 9 and 10 from a friend who upgraded to X4. Having used and liked those, I tried his X4 and then downloded the trial version for myself. VS X4 is the only consumer program I can find that has audio mixing on playback, so I'm trying to do what I can to be certain that I'm getting a good product.

I make heavy use of multi-trim, speed/time lapse and audio level editing. I leave audio to the last. Due to camera changes, I began with AVI files, but now am using MPEG2, 4:3 740X480 29.97 fps with audio of 48000hz and a bit rate of 256 kbps.

I can edit project files for as long as I want to sit here doing it. Trimming, speeding up and adding as many transitions as I like within a 30 minute project. The preview playback will get a little choppy and often the audio will go out of sync, but if I close the program and re-open it, those problems will usually be corrected. Regardless of whether or not I close and re-open the program, when I begin adding soundtracks and adjust the levels, the program will inevitably pop up an error window and shut down.

I have tried doing all of the video editing and transitions, then creating a single file via "Share", closing the program, re-opening, starting a new project and bringing the new file into the timeline thinking that it wouldn't have to "remember" all the previous editing. From there I would attempt to do audio, but I get the same sesult.

I have uninstalled both all VS programs, removed all remaining folders, and re-downloaded the trial without re-installing 9 and 10. I can still open the vsp files saved in other folders, and I can still edit the video portions, but the program freezes when attempting to edit audio.

I did not have any issues with 9 or 10 until the download of X4. After x4 failed, I went back to 10, which worked for about 3 projects and then failed in the same manner, hence my reasoning for unistalling all programs.

It's almost as though this program makes a folder specifically for edit memory, and when it's full, it's full, and you don't get to edit anymore. Neither can you empty the folder. I've tried the different disc caching and acceleration options given in the manual, but nothing makes any difference.

I have several videos posted on YouTube, all of which were created with VS 9, 10 and a couple with X4. I would prefer to continue using a program that allows audion mix "on the fly". But now I can't even complete a project in VS10.

For a sample of my postings on YT go here: [URL]

It's a half hour long, but shows the extensive amount of editing done to make the final product.