From the Release Notes:
Changes between nb204 and nb204b (March 26, 2026)
This is a bugfix release. There are new Companions for both Android
and iOS (2.78a and 2.78.1). As of this writing the iOS Companion is
still in review by Apple, but should be released when the review is
complete.
Changes:
- Fix crash in iOS Bluetooth low energy component.
- Fix legacy connects in non-secure contexts. This mostly effects
developers running the MIT App Inventor server locally. - Fix a bug in absolute arrangements that can cause The Left and Top
properties to not be properly sent to the Companion. - Revert a change to scrolling that broke Height arrangements when
Height was set to Automatic. - Fix the bug where projects would not open if the last screen they
had opened was deleted. - Always set RECEIVER_EXPORTED in the Texting component. We had set
this permission for newer Android versions, but not older versions
which didn't support it. However we have found “older” versions
that expected it. So now we always set it. - Fix the “Matrix Error: Invalid dimension size: 0” bug. Matrices are
now marked when stored so empty lists will not be confused with
them. Note: Stored matrices from before this update may load as
lists.