[Solved] Can't start VirtualBox, incompatible Qt library

[solamour]

After world update, VirtualBox stopped working.

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Qt FATAL: Cannot mix incompatible Qt library (6.8.3) with this library (6.9.1)
Aborted

I do have "6.9.1", but not quite sure where "6.8.3" is from.

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[I] dev-qt/qtbase
     Available versions:  (6) 6.9.1-r2(6/6.9.1)^t{gpkg} **6.9.9999(6/6.9.9999)*l^t **6.10.9999(6/6.10.9999)*l^t **6.9999(6/6.9999)*l^t
       {+X accessibility brotli +concurrent cups custom-cflags +dbus eglfs evdev gles2-only gssapi gtk +gui icu journald +libinput libproxy mysql +network nls oci8 odbc opengl postgres renderdoc sctp +sql +sqlite +ssl syslog test tslib +udev vulkan wayland +widgets +xml zstd}
     Installed versions:  6.9.1-r2(6/6.9.1)^t{gpkg}(05:50:41 AM 07/12/2025)(X concurrent dbus gui libinput network nls sql sqlite ssl udev widgets xml zstd -accessibility -brotli -cups -custom-cflags -eglfs -evdev -gles2-only -gssapi -gtk -icu -journald -libproxy -mysql -oci8 -odbc -opengl -postgres -renderdoc -sctp -syslog -test -tslib -vulkan -wayland)
     Homepage:            https://www.qt.io/
     Description:         Cross-platform application development framework

I'd appreciate any suggestions on what to look for.
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sol

[Hu]

You have some other qt package that was not upgraded. What is the output of emerge --pretend --verbose $(eix '-I*' --format '<installedversions:NAMESLOT>' dev-qt/)?

[solamour]

Rebuilding qtbase and virtualbox fixed the issue.

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emerge -v qtbase
emerge -v virtualbox

Still not clear why it happened in the first place, but well, it's no longer a problem, so I'm going to leave it at that. Thanks everyone for sharing your thoughts.
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sol