Cydia Substrate received an update this morning that fixes issues with the 32-bit armv7 slice. This update, which is now available for download for all jailbroken users, prevents issues where extensions wouldn't load into Cydia.
There is also a need for all 32-bit binaries to be recompiled. Due to a change implemented by Apple for iOS 9, 32-bit binaries that aren't recompiled are likely to fail or crash if they are not recompiled. This means that all developers that have published 32-bit binaries, in particular Cydia Substrate extensions, have a little work to do.