UserForm Initialize Code Closes UserForm

When I run the userform initialize procedure to reset the values in text boxes and the like instead of resetting like it should, now it closes the userform completely and then won't allow me to show it again, what could be the problem?

Private Sub UserForm_Initialize()
Me.MultiPage1.Value = 0
TextBox3.Value = ActiveWorkbook. Sheets("Sales Invoice"). Range("G15").Value
Dim hWndForm As Long
Dim hMenu As Long
hWndForm = FindWindow("ThunderDFrame", Me.Caption) 'XL2000
hMenu = GetSystemMenu(hWndForm, 0)
DeleteMenu hMenu, SC_CLOSE, 0&
End Sub

The Dim stuff down is to gray out the x button, there are also some module level declarations to go with that...

Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal lpClassName As String, ByVal lpWindowName As String) As Long
Private Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As Long, ByVal bRevert As Long) As Long
Private Declare Function DeleteMenu Lib "user32" (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long
Private Const SC_CLOSE As Long = &HF060

the userform shows when the workbook opens and is then hidden when the user has finished entering values, then when the user goes through the process of being asked to print and save, they are then asked if they would like to create a new record, if yes then it shows the userform again, but the userform is still filled with all the stuff previously entered. I tried using the unload me instead of hiding and that wouldn't work at all, didn't give errors just didn't show the userform either, this at least shows the userform, but now when the user goes to clear the information by initializing the userform again, it simply closes the userform and then it can't be shown again either.

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This is the link to the ZIP, and here are some instructions for setting it up to work.

The contents of this need to be unzipped into a folder called SyntheticShield that is placed in the C: drive that way all paths begin with C:SyntheticShield and then the other folders or files will be referenced correctly. The template I'm having problems with is the SyntheticShieldInvoiceMaker template, when you open it you'll be prompted whether you want to create a new invoice, number is final blah blah blah, say yes, then it will ask if you are importing from the Quotemaker which you aren't say no, it should then show the userform as it should. Then you can go through that process and by pressing either the create invoice or go to template directly whatever, you can hide the userform. Then you press the command button (red) a userform is brought up asking if you'd like to save without emailing, save with emailing or close controls, as for right now, I'm just getting the save without emailing to work the rest is all the same just a few tidbits of code. So click save without emailing, it should then prompt an are you sure message box, click yes it will do some things, then it will ask if you want to print, click no, then it will ask do you want to create a new invoice, click yes, this should then start the process all over again by calling the workbook_open procedure, however, when you go through everything, and click no to the import from quotemaker part it won't show the userform. And at one point it would, but then I couldn't initialize the userform without it disappearing and not being allowed to be shown...I tried putting a command button on the template to show the userform, but it wouldn't do it either.