One of my company's sites has right-click functions disabled (yes, I realize this doesn't really stop people from stealing content - it wasn't my choice). I've noticed when I use a spider emulator (seo-browser.com) that our image alt tags appear to be invisible to the spiders. I can see the alt tags on the actual site, and I've verified that they are in the code, but they don't seem to show up for spiders. Could this be caused by our right-click disabling?
Most people in the thread say that it should have no impact on spiders crawling the site.
I then saw an older thread from Google Webmaster Help where Googler, JohnMu, said the same thing. He said and I bolded the key point: