"User-defined type not defined" error with button only, no code errors
<p><strong>Issue:</strong>
When I click a macro assigned button in my workbook the following error appeared: <br></p>

<blockquote>
  <p>"User-defined type not defined" <br></p>
</blockquote>

<p>The error box appears, however, it did not highlight any code that may have produced the error. When I ran the macro from the compiler, the code executed without error. I was able to figure out that when I inserted a new button and assigned the same macro to the new button, the code executed without error. <br></p>

<p>Facts about the workbook:</p>

<ul>
<li>The workbook includes multiple macros and multiple sheets as well as buttons linked to most of the macros (6 buttons)</li>
<li>The workbook is saved daily with a new date as modifications are made. The same button in previous workbooks do not produce this error.</li>
<li>There was an issue with one button a month ago and it was replaced, now a different button has this same issue. I would like to avoid replacing buttons every time this error occurs as I am not the end user.</li>
<li>This workbook was originally created in Excel 2010 but I have been using it in Excel 2013, though I made the switch months before this issue (not sure if info is relevant).</li>
</ul>

<p>I saw a similar issue <a href="https://stackoverflow.com/questions/19680402/excel-vba-compile-throws-a-user-defined-type-not-defined-error-but-does-not-go">here</a>, however the issue for me is not in my code, only in the form control. I would just like to know if anyone has seen this before and if there is a way to avoid needing to replace the buttons every time they "go bad."</p>