1. can I update to Joomla 3.4 without breaking the theme?
2. Uncaught ReferenceError: Virtuemart is not defined ...where do i have to declare virtumart?
3. these files are all missing....not only the files but the corresponding folders and paths do not exist
2015-03-18 20:05:58.107less-1.5.0.min.js:11 Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check http://xhr.spec.whatwg.org/.
2015-03-18 20:06:01.550http://xxx/templates/accio/images/temp/mobile-video-image.jpg Failed to load resource: the server responded with a status of 404 (Not Found)
2015-03-18 20:06:02.102http://xx/js/layerslider/skins/accio/skin.css Failed to load resource: the server responded with a status of 404 (Not Found)
2015-03-18 20:06:02.427http://xxx/templates/accio/images/temp/mobile-video-image.jpg Failed to load resource: the server responded with a status of 404 (Not Found)
2015-03-18 20:06:04.733http://xxx/templates/accio/images/temp/mobile-video-image.jpg Failed to load resource: the server responded with a status of 404 (Not Found)
https://www.youtube.com/get_video?noflv=1&video_id=cm3MoSSQBYY&cpn=kci8TB6y...http%3A%2F%2Fxxx%2F&fmt=247&ptk=youtube_none&splay=1&start=1000 Failed to load resource: the server responded with a status of 404 (Not Found)
2015-03-18 20:16:33.221http://xxx/modules/mod_st_tweet/assets/css/mod_st_tweet.default.css Failed to load resource: the server responded with a status of 404 (Not Found)
2015-03-18 20:16:33.482http:/xxx/js/layerslider/skins/accio/skin.css Failed to load resource: the server responded with a status of 404 (Not Found)
1. depends on your Joomla template - nothing to do with VirtueMart
2. Sounds like a JavaScript problem, usually reklated to the choice of Joomla template/jQuery versions
3. None of those are related to VirtueMart.