SQL Server (specific) table not updating - sql

Question

I am having a really strange issue with classic asp insert/update that worked flawlessly for years and was never altered. Out of the blue, the table is no longer updating or taking new records. The code does not throw any errors and the SQL Server log shows no errors either. Other tables in the same database work fine so I can insert and update without issues.
Is there a way to find out what is happening with this table or whether it is locked for some reason. I restarted SQL Server and web application, even the server and no luck.
I updated the table directly in SQL Server and it updates and inserts new records fine.
I used the same code on another table and was able to update records.
Can someone please point me in the right direction as I am out ideas on what may be causing this.
Thanks in advance.
Here is the code:
<%
' *** Edit Operations: (Modified for File Upload) declare variables
Dim MM_editAction
Dim MM_abortEdit
Dim MM_editQuery
Dim MM_editCmd
Dim MM_editConnection
Dim MM_editTable
Dim MM_editRedirectUrl
Dim MM_editColumn
Dim MM_recordId
Dim MM_fieldsStr
Dim MM_columnsStr
Dim MM_fields
Dim MM_columns
Dim MM_typeArray
Dim MM_formVal
Dim MM_delim
Dim MM_altVal
Dim MM_emptyVal
Dim MM_i
MM_editAction = CStr(Request.ServerVariables("SCRIPT_NAME"))
If (UploadQueryString <> "") Then
MM_editAction = MM_editAction & "?" & Server.HTMLEncode(UploadQueryString)
End If
' boolean to abort record edit
MM_abortEdit = false
' query string to execute
MM_editQuery = ""
%>
<%
' *** Insert Record: (Modified for File Upload) set variables
If (CStr(UploadFormRequest("MM_insert")) = "update") Then
MM_editConnection = MM_ar_inventory_STRING
MM_editTable = "Artists"
MM_editRedirectUrl = "artists_add.asp?status=ok"
MM_fieldsStr = "ArtistName|value|WebsiteStatus|value|Biography|value|Notes|value|ImageFileName|value|ModifiedBy|value|DT|value|IpAddress|value"
MM_columnsStr = "ARTST_Artist|',none,''|ARTST_WebsiteStatus|',none,''|ARTST_Biography|',none,''|ARTST_Notes|',none,''|ARTST_ArtistImageFileName|',none,''|ARTST_ModifiedBy|',none,''|ARTST_LastModified|',none,NULL|ARTST_LastModifiedIP|',none,''"
' create the MM_fields and MM_columns arrays
MM_fields = Split(MM_fieldsStr, "|")
MM_columns = Split(MM_columnsStr, "|")
' set the form values
For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
MM_fields(MM_i+1) = CStr(UploadFormRequest(MM_fields(MM_i)))
Next
' append the query string to the redirect URL
If (MM_editRedirectUrl <> "" And UploadQueryString <> "") Then
If (InStr(1, MM_editRedirectUrl, "?", vbTextCompare) = 0 And UploadQueryString <> "") Then
MM_editRedirectUrl = MM_editRedirectUrl & "?" & UploadQueryString
Else
MM_editRedirectUrl = MM_editRedirectUrl & "&" & UploadQueryString
End If
End If
End If
%>
<%
' *** Insert Record: (Modified for File Upload) construct a sql insert statement and execute it
Dim MM_tableValues
Dim MM_dbValues
If (CStr(UploadFormRequest("MM_insert")) <> "") Then
' create the sql insert statement
MM_tableValues = ""
MM_dbValues = ""
For MM_i = LBound(MM_fields) To UBound(MM_fields) Step 2
MM_formVal = MM_fields(MM_i+1)
MM_typeArray = Split(MM_columns(MM_i+1),",")
MM_delim = MM_typeArray(0)
If (MM_delim = "none") Then MM_delim = ""
MM_altVal = MM_typeArray(1)
If (MM_altVal = "none") Then MM_altVal = ""
MM_emptyVal = MM_typeArray(2)
If (MM_emptyVal = "none") Then MM_emptyVal = ""
If (MM_formVal = "") Then
MM_formVal = MM_emptyVal
Else
If (MM_altVal <> "") Then
MM_formVal = MM_altVal
ElseIf (MM_delim = "'") Then ' escape quotes
MM_formVal = "'" & Replace(MM_formVal,"'","''") & "'"
Else
MM_formVal = MM_delim + MM_formVal + MM_delim
End If
End If
If (MM_i <> LBound(MM_fields)) Then
MM_tableValues = MM_tableValues & ","
MM_dbValues = MM_dbValues & ","
End If
MM_tableValues = MM_tableValues & MM_columns(MM_i)
MM_dbValues = MM_dbValues & MM_formVal
Next
MM_editQuery = "insert into " & MM_editTable & " (" & MM_tableValues & ") values (" & MM_dbValues & ")"
If (Not MM_abortEdit) Then
' execute the insert
Set MM_editCmd = Server.CreateObject("ADODB.Command")
MM_editCmd.ActiveConnection = MM_editConnection
MM_editCmd.CommandText = MM_editQuery
MM_editCmd.Execute
MM_editCmd.ActiveConnection.Close
If (MM_editRedirectUrl <> "") Then
Response.Redirect(MM_editRedirectUrl)
End If
End If
End If
%>

Answer 1

I notice that UploadQueryString is undefined so if you add this as the fist line
<%OPTION EXPLICIT%>
I guess that you will get some meaningful error messages

Answer 2

The craziest solution to the problem that totally seems unrelated was to disable Symantec Endpoint Protection (Network Protection) and it worked for a reason I cannot possibly explain! Thank you all for the suggestions above.