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Here's two scenarios which seem to come up on fairly frequent basis...
- When using a ContentEditorWebPart, an error message stating "unable to retrieve properties at this time" appears whenever saving changes. This is error effectively prevents all changes from being saved.
- A web part that renders fine but you cannot export the part nor can you open the page using FrontPage 2003. The error message that you receive states "A Web Part or Web Form Control on this Web Part Page cannot be displayed or imported because it is not registered as safe on this site."
Both of these problems have a common failure point and both are dependent upon how your server is either configured and/or the location of your web part assemblies.
There are two general server configurations that cause the failure to occur:
- Statically bound servers
- Servers using IIS host header with assemblies installed in the BIN folder
For the first item, static IP servers are not supported. The fix is to adjust your server settings to use "All unassigned".
For the second item, whenever using IIS host headers to differentiate your virtual servers, assemblies installed in the BIN are currently not supported. The workaround is to install all web part assemblies into the GAC.
For more information, please reference the following KB article.