main form disappears after paste-append action using VBA

[flyingjohan]

Hello,

I have an access 2003 database in which I built the opportunity to make
a list of data in Excel and paste it later in the access-database.

When a user copied the excel-data (just using plain ctrl-C) there's a
button in the database pasting it in the correct table. I pasted the
code below:

On Error GoTo Err_Paste_data__back_to_Access_Click

If Nz(Forms![FSwissQuote]![Customer], 0) = 0 Then
MsgBox "You have to select a customer first! Please correct the
problem and paste again afterwards.", vbCritical, "Please choose a
customer first!"
Cancel = True
GoTo Exit_Paste_Data_Back_To_Access_Click
End If

Forms![FSwissQuote]![FQuoteLines].SetFocus
DoCmd.GoToControl "Quantity"
DoCmd.RunCommand acCmdPasteAppend

Exit_Paste_Data_Back_To_Access_Click:
Exit Sub

Err_Paste_data__back_to_Access_Click:
MsgBox Err.Description
Resume Exit_Paste_Data_Back_To_Access_Click

This code works fine on my machine. On another machine (using Terminal
Server) however, the result is that the data is copied, but the main
form completely disappeared. The user only sees the just copied records
in the subform in data-sheet format. Does anybody has any clue as to
how this is possible and what I can do to solve it?

Regards,
Johan.