The module settings page into which your custom settings control is injected is automatically wrapped in an Upade panel so I suspect that is the cause of the problem. As for other module controls, if Supports Partial Rendering is enabled in the install manifest or when manually editing the module control's registration, your control will also be wrapped in an update panel.

I would recommend using the DnnFilePicker control as it allows the user to select from either an existing file on the server (and properly observes folder permissions as set in File Manager) or to upload from the user's computer.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner