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Problems with Thunderbird and Firefox

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Good day everyone here in this form!

Yesterday I've installed the very last (new) version of Malwarebytes. It works fine as usual but neither Firefox nor Thunderbird (current versions each) does since then. Both programs hanging up on start and cannot be closed - even not with the task manager of Windows 10. A restart of the PC is nessessary...

I could solve the problem by preventing Malwarebytes to start in the background with Windows 10.

Can anyone confirm this and/or maybe have a solution for this problem please?

Thanks a lot in advance- kind regards!


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***This is an automated reply***


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17 minutes ago, BertGroner said:

s it not possible to edit or delete posts here?

 No it is not possible to edit.

You mis read the instructions.

Once the file is downloaded, open your Downloads folder/location of the downloaded file
    Double-click mb-support xxx.xx.exe to run the report
        You may be prompted by User Account Control (UAC) to allow changes to be made to your computer. Click Yes to consent.
    Place a checkmark next to Accept License Agreement and click Next
    You will be presented with a page stating, "Get Started!"

    Do NOT use the button “Start repair” !
    Click the Advanced tab on the left column
    Click the Gather Logs button

    A progress bar will appear and the program will proceed with getting logs from your computer
    Upon completion, click a file named mbst-grab-results.zip will be saved to your Desktop. Click OK
    Please attach the ZIP file in your next reply.

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Your logs show that you are running Kaspersky.  There is currently a known conflict with Kaspersky and Ransomware Protection in Malwarebytes which causes the symptoms you describe.  It should be resolved by disabling the Ransomware Protection component in Malwarebytes until the problem is resolved by Kaspersky's developers, Malwarebytes' Developers, or both.  I have also seen one user so far who had this issue that reported that once they installed patch 'k' for Kaspersky the conflict was resolved so it would also be worthwhile to check and make sure that you have the latest patch for Kaspersky installed (it should show 'patch k' in the about details for the program).

Please let us know how it goes.


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Thanks exile360 for all this...

I use Kaspersky Internet Security (German) v20.0.14.1085 (f) - current database and updates - and had a look to see whether I can find such items like "patches" anywhere in it's windows. Unfortunately I haven't been successful. In the net I 've found "patch k" only concerning Kasperky 2018 but without an option to download (something).

Any idea here?

Thanks again!


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They often update non-English/non-US and non-Russian builds later than others so it is quite possible that they haven't rolled out the latest patch for the German version yet.  That said, I did find a reference to patch 'f' on the Kaspersky Labs forums in this topic, but I think that was for the US/English version so it might still be a while before the latest patch makes it to users of the German language version.  You could try updating manually by opening Kaspersky and looking for an option to check for updates, especially if they have a button or link to check for new product versions/program build updates as that may allow you to get the latest build.

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You're welcome :)

By the way, I just got some new information.  Apparently the new patch that Kaspersky released only fixed the problem for users of their 2019 version, not the latest 2020 version so we are still waiting on a fix for Kaspersky's 2020 products.  I am hoping that their upcoming patch for the 2020 version (patch 'g') will fix the issue just as the recent patch for the 2019 version did because we have a lot of customers trying to run Kaspersky and Malwarebytes together having these issues.

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Hello BertGroner.

In the meantime,  regarding Firefox & Thunderbird:

add that specific application as a Exclusion in Malwarebytes.

Exclude affected applications within Malwarebytes.


Test that out.  See if it helps for the time being.

Edited by AdvancedSetup
corrected font issue
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