After upgrade to EPiServer 4.62B all URL to files that are in folders that are virtualShares are case-sensitive. That means that if I reffer to file with url. www.xxx.com/Myfolder/upload/my.jpg it will be ok, but when I will do the same with www.xxx.com/MyFolder/upload/my.jpg I will get 404. Application is installed in virtual directory (its name is Myfolder) - if it is important.
Thank you in advance for any help.