Simulation to MP4: Distorted Slides or Audio

Hello,
I mainly use software simulation. However, when I publish the video for YouTube, the MP4 includes some visually distorted slides (e.g. with parts of two slides on each other or with red blocks), as well as missing mouse clicks, and "poff" sounds and/or spoilt parts at the beginning of auido on a slide. Sometimes, when I republish the problem disappears from one section and appears in another section.
I tried both Windows 7 (even a newly installed OS) and Mac OS 10.6.8.
Sometimes, the problem was just in the player; but I have tried several players and the problem appears on all of them.
For the audio, I use the TTS NeoSpeech Adobe plugin.
I use the latest Adobe Captivate version 6.0.1.240
I have files showing the problems with their corresponding project files, but I cannot publish them publicly. If someone from the Adobe Support can contact me so that I send them the files, I will highly appreciate that.
Kind regards,
Mina

Dear All,
I have received this suggestion from the support, and it solved my main problem of distorted images: go to Edit > Preferences > SWF Size and Quality > move the slider down to "Custom" and deactivate the two options of compression.
According to the manual:
Advanced Project Compression Enables Adobe Captivate to take into account only the difference between two slides instead of publishing both the slides. The compression reduces the size of the published project. Choosing this option can increase the time taken to preview or publish the project. Compressed projects sometimes do not play as intended in Flash Player.
Please read the last sentence. If this option is serious like that, I am not sure why it is activated by default. I think it should be deactivated by default.
Derek, could you please let us know if this helps you. Many thanks in advance!
Kind regards,
Mina

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