# Troubleshooting

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<summary>I am running macOS Sonoma and filing has become slow and unreliable.</summary>

macOS Sonoma removed Mail Plug-In support, so MsgFiler Engine no longer works. Please upgrade to MsgFiler 4 on the Mac App Store.

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<summary><strong>I upgraded to El Capitan and filed messages keep reappearing in the original mailbox. I am using Gmail.</strong></summary>

Did you hide the **All Mail** folder in Gmail’s web settings? If so, you will need to reveal this mailbox in IMAP for MsgFiler to work properly. See this [article on TidBits for more details](http://tidbits.com/article/14219).

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<summary><strong>Mail on OS X Mavericks/Mountain Lion has disabled the MsgFiler Engine plugin. Filing is slow again in MsgFiler 3!</strong></summary>

Update to MsgFiler 3.1.4 and install the latest version of the MsgFiler Engine

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<summary><strong>Filing is so slow after upgrading to Mavericks/Mountain Lion/Lion!</strong></summary>

Re-install MsgFiler Engine. All Mail plugins are automatically disabled following an upgrade of the operating system.

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<summary><strong>I’m an old user of the MsgFiler Mail Plugin. Installing MsgFiler Engine makes the original mail plugin disappear.</strong></summary>

Install the latest version of MsgFiler Engine to resolve this problem.

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