I have checked your site, and it is obvious that not only user profile images are missing - none of the remaining handler-based functionality is working (sitemaps, captcha, etc). Something is wrong with the IIS configuration for your site, as it does not process requests with axd and ashx extensions, although they appear to be correctly registered in the web.config.
I assume that your site is running on IIS 7 - integrated mode and ASP.NET 4, so you should look in the <system.webServer><handlers> section. We should probably try to contact their support - we did not have this kond of problems when testing Arvixe hosting a few months ago.
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