If I understand correctly the buttons are on an excel sheet (not in a user form) so your issue because you are calling the buttons incorrectly. you can't simply call the named buttons you must look into the sheet.buttons property like this
ActiveSheet.Buttons("btnStart").
Also if you have named sheets I would use the sheetname rather than ActiveSheet
Sheets("sheetname").Buttons("btnStart").
One more note, that enabling/disabling a button works BUT it doesn't make the button appear enabled/disabled. To do this you also have to change the font color.
ActiveSheet.Buttons("btnStart").Font.ColorIndex = 15 '15 is grey, 1 is black
---- edit: code changed ---
REASON: After doing some more research it seems there are problems with my original solution. The most important is that the "enabled" property has no effect in excel 2010. Another route would be using activeX controls, BUT, a recent windows update (dec 2014) prevents activeX controls from running without deleting some system files (which would have to be done for each user, on every computer this code may run on -_- good job MS SOURCE)
This new solution should avoid all those problems. It uses two global variables start_btn_disabled and stop_btn_disabled I assume each button in your form (btnStart and btnStop) have a macro assigned to them? Simply check the global variable at the very beginning of the the sub if the button is disabled then quit the sub, so even though the click is still processed (it will always be processed in excel 2010 as stated before) the code doesn't run. So it behaves as though it was disabled. In my code I made a sub called btnStopClicked that would run when you click 'btnStop' In order to assign the macro to a button, right click the button, select "assign macro" and select the appropriate macro. I also created a similar sub for when you click the start button
'these are global variables and should be declared at the top of the module
'outside of any sub/function
'
'Note we use DISabled rather than enabled, because by default
'booleans = False. This means as soon as the form opens both these buttons
'will be enabled without any extra work.
'If you want to change this (make start button enabled and stop disabled,
'when the workbook opens simply change all the "stop_btn_disabled" to
'"stop_btn_enabled" and uncomment the following line) make sure you change the
'variable names so they make sense
'Dim stop_btn_enabled As Boolean 'initializes to false
Dim start_btn_disabled As Boolean 'intializes to false
Dim stop_btn_disabled As Boolean 'intializes to false
'Most of this code remains the same as before
Sub btnStart()
ActiveSheet.Unprotect
Cells(Rows.Count, 5).End(xlUp).Offset(1) = Date
Cells(Rows.Count, 6).End(xlUp).Offset(1) = Now
Cells(Rows.Count, 7).End(xlUp).NumberFormat = "hh:mm"
Cells(Rows.Count, 8).End(xlUp).Offset(1) = Environ("username")
'now we set the state of the global variable
start_btn_disabled = True
'makes the button appear greyed out
ActiveSheet.Buttons("btnStart").Font.ColorIndex = 15
'now we set the state of the global variable
stop_btn_disabled = False
'makes the button black like normal
ActiveSheet.Buttons("btnStop").Font.ColorIndex = 1
End Sub
Sub btnStop()
ActiveSheet.Unprotect
Cells(Rows.Count, 7).End(xlUp).Offset(1) = Now
Cells(Rows.Count, 7).End(xlUp).NumberFormat = "hh:mm"
'now we set the state of the global variable
stop_btn_disabled = True
'makes the button appear greyed out
ActiveSheet.Buttons("btnStop").Font.ColorIndex = 15
'now we set the state of the global variable
start_btn_disabled = False
'makes the button black like normal
ActiveSheet.Buttons("btnStart").Font.ColorIndex = 1
End Sub
'and now the real key is checking the globals before running the code
'when you click "btnStop" button this is the code that runs, you may have
'named the sub something different, I just named it this way so it's clear
'what the sub does
Sub StopBtnClicked()
'must be the first bit of code in the btn click sub
If (stop_btn_disabled) Then
Exit Sub
End If
'the rest of the code when you click stop button goes here
'the only way to get to this point is if the but is enabled
End Sub
Sub StartBtnClicked()
'must be the first bit of code in the btn click sub
If (start_btn_disabled) Then
Exit Sub
End If
'the rest of the code when you click start
End Sub
if this solves your problem, please mark it as the answer