Thank you Larry, thaty was the problem, I was missing that upload link.

Unfortunately, after uploading the image, I started getting a database access error that has thrown down my whole site

My DNN experience is not being an easy one...

Server Error in '/' Application.

---

A floating point exception occurred in the user process. Current transaction is canceled.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: A floating point exception occurred in the user process. Current transaction is canceled.

Source Error:

[SqlException: A floating point exception occurred in the user process. Current transaction is canceled.]
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream) +742
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior) +45
   Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, String commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
   Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters)
   Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteReader(String connectionString, String spName, Object[] parameterValues)
   DotNetNuke.Data.SqlDataProvider.GetUser(Int32 PortalId, Int32 UserId) +113
   DotNetNuke.Entities.Users.UserController.GetUser(Int32 PortalId, Int32 UserId) +46
   DotNetNuke.Entities.Portals.PortalSettings.GetPortalSettings(Int32 TabId, PortalAliasInfo objPortalAliasInfo) +766
   DotNetNuke.Entities.Portals.PortalSettings..ctor(Int32 tabId, PortalAliasInfo objPortalAliasInfo) +93
   DotNetNuke.HttpModules.UrlRewriteModule.OnBeginRequest(Object s, EventArgs e) +3577
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +60
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +87

Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032

Thanks Crispy, you are absolutely correct. It was an amazing coincidence (those that happen exactly when I have a prototype to finish by monday...) that I have a CommunityServer site on the same dedicated server and that was the one that got the DB in trouble at around the same time I upoloaded the image. After some investigation, I found the problem, and then the solution:

http://www.kdkeys.net/blogs/kingsley.tagbo/archive/2005/04/04/4457.aspx

It had NOTHING to do with Gallery or DNN, so I'm still a happy camper.

I would like to thank you all for the quick replies and for all the help and suggestions. This is a great project, and I will be trying to contribute as well, maybe building some kind of free module once i get the hang of it.

Once again, thanks !

The SimpleGallery module is not a DNN project.  Please get the support from the vendor.