I have seen this error reported twice on the OOoForum so I checked it out and it
seems accurate.

Option Explicit

Sub Main
   Dim aText(1,2) As String 
   Dim iub1%, j%
   Dim iub2%, i%
   iub1 = uBound(aText(),1)
   iub2 = uBound(aText(),2)
   For i = 0 To iub1
      For j = 0 To iub2
         aText(i,j) = "i =" & cstr(i) & " j=" & cstr(j)
      Next
   Next
   REM Place a break on the print statement and add a watch on 
   REM aText(1,2) and on aText(2,1). 
   REM Watch aText(1,2) displays {<Invalid index>}
   REM Watch aText(2,1) displays {i=0 j=0}
   REM Both of these watch values are wrong.
   REM The print statement is correct.
   REM Watching other values, such as 0,0 or 1,0 work.
   REM The print statement displays "i=1 j=2"
   Print aText(1, 2)
End Sub