Steps to reproduce the issue

Fresh install of Joomla! 2.5.x + VirtueMart 2.6.10.
Default SEF options (Joomla! & VM).
Add a product with dots in name and after save the Product Alias will contain that dot.
Create a menu item with Virtuemart Frontpage / Category Layout to acceess the product details page.

Expected result

Product details page

Actual result

"404 not found" page & error_log will output something like:

"File does not exists: public_html/category-name, refferer http://website.com/category-name/product-name-alias.with-dots.in-it/"

System information (as much as possible)

• linux host;
• php 5.3 & php 5.3;

Additional comments

As described the issue here I found a temporary solution by removing the code that blocks the dot in urls from Joomla's default .htaccess file.

I have removed the /[^.]* from this line:

RewriteCond %{REQUEST_URI} /component/|(/[^.]*|\.(php|html?|feed|pdf|vcf|raw))$ [NC]

Joomla! core components seem to convert the dot for the alias field if exists in title, so that's why there are no problems, but for components that does not do this, it would be better to have this fixed.