Cannot query an access database if open

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I am having an issue currently, where if I open my Access database (Its not open Exclusively. Just open to where you see a list of tables/queries/etc), I get the following error on my website:

(Line 253 is highlighted)

Length cannot be less than zero.
Parameter name: length 
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.ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length

Source Error: 


Line 251://		try{
Line 252:
Line 253:			LeftNavMain();
Line 254:
Line 255:			string strSQL = "";
 

Source File: c:\Inetpub\Intranet\Testing\NewTemplate\phonedir.aspx    Line: 253 

Stack Trace: 


[ArgumentOutOfRangeException: Length cannot be less than zero.
Parameter name: length]
   System.String.InternalSubStringWithChecks(Int32 startIndex, Int32 length, Boolean fAlwaysCopy) +2848241
   Consolidated.Intranet.Error_Handler(String ex) +254
   Consolidated.Intranet.LeftNavMain() +511
   ASP.phonedir_aspx.__Render__control2(HtmlTextWriter __w, Control parameterContainer) in c:\Inetpub\Intranet\Testing\NewTemplate\phonedir.aspx:253
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +2065883
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +59
   System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +68
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +37
   System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +130
   System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +24
   System.Web.UI.Page.Render(HtmlTextWriter writer) +26
   System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +25
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +121
   System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +22
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1896

This particular function is used to create the side-menu, which is defined through the database.

Any and all help will be GREATLY appreciated! Ive been experiencing this issue for about 2 months, now. Its never happened before.

Thanks in advance!

~Derek