hi i tried to upgrade and i got teh following log
Upgrade Status Report
00:00:00.093 - Upgrading to Version: 05.06.00
00:00:00.328 -   Executing Script: 05.06.00.SqlDataProvider Success
00:00:03.234 -   Executing Application Upgrades: 05.06.00 Success
00:00:06.078 -   Cleaning Up Files: 05.06.00 Success
00:00:06.140 -   Updating Config Files: 05.06.00 Success
00:00:06.156 - Performing General Upgrades
00:00:06.968 - Installing Optional Modules:
00:00:07.125 -   Installing Package File HTML_Community_05.06.00_Install:  Success
00:00:18.078 -   Installing Package File Messaging_05.06.00_Install:  Success
00:00:24.984 -   Installing Package File Taxonomy_05.06.00_Install:  Success
00:00:28.078 -   Installing Package File Telerik_05.06.00_Install:  Error!
00:00:32.390 - Installing Optional Skins:
00:00:32.390 - Installing Optional Containers:
00:00:32.390 -   Installing Package File Nukeville.Morpheus.Containers:  Success
00:01:35.359 - Installing Optional Languages:
00:01:35.375 - Installing Optional Providers:
00:01:35.375 -   Installing Package File AspNetMembershipProvider_05.06.00_Install:  Success
00:01:36.203 -   Installing Package File CorePermissionProvider_05.06.00_Install:  Success
00:01:37.015 -   Installing Package File CoreSitemapProvider_5.6.0.0_Install:  Error!
00:01:37.859 -   Installing Package File DatabaseLoggingProvider_05.06.00_Install:  Success
00:01:38.875 -   Installing Package File DNNMembershipProvider_05.06.00_Install:  Success
00:01:39.921 -   Installing Package File DNNMenuNavigationProvider_05.06.00_Install:  Success
00:01:40.984 -   Installing Package File DNNTreeNavigationProvider_05.06.00_Install:  Success
00:01:41.984 -   Installing Package File FckHtmlEditorProvider_02.00.04_Install:  Success
00:03:18.515 -   Installing Package File FileBasedCachingProvider_05.06.00_Install:  Success
00:03:19.250 -   Installing Package File FileModuleCachingProvider_05.06.00_Install:  Success
00:03:20.937 -   Installing Package File MemoryModuleCachingProvider_05.06.00_Install:  Success
00:03:22.156 -   Installing Package File SchedulingProvider_05.06.00_Install:  Success
00:03:23.125 -   Installing Package File SearchIndexProvider_05.06.00_Install:  Success
00:03:24.171 -   Installing Package File SearchProvider_05.06.00_Install:  Success
00:03:25.484 -   Installing Package File SolpartMenuNavigationProvider_05.01.00_Install:  Success
00:03:27.062 -   Installing Package File TelerikEditorProvider_05.06.00_Install:  Error!
00:03:49.203 - Installing Optional AuthSystems:
00:03:49.218 -   Installing Package File LiveID_01.00.01_Install:  Success
00:03:53.796 -   Installing Package File OpenID_02.00.00_Install:  Success
00:03:57.625 - Installing Optional Packages:

I upgraded from 5.5.1 to 5.6.0. All the process was perfect, no warning, all green but when you put website url in any browser (latest chrome, ff, ie) then you got error message "DotNetNuke Error. Windows Vista", then you clink on Return to website and everything is ok. I checked everything and the website is working completely ok except that error message at the beginning. I restored to an old version and did upgrade again: same result, same error message. I checked everything of hosting settings, nothing wrong. "Return to website" point to "default.aspx" so I checked if hosting have correct setting and it is ok.

Please check the site's portal aliases either from the site's Admin menu (when logged in as host navigate to Admin-->Site Settings and open advanced settings section) or by examining the PortalAlias table in the database.

Do you see a large number of entries for .png images with each path containing a reference to /skins/ folder? 

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Bill, WESNet Designs
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