BBC BASIC for Windows version 6.10a includes the following changes: 

Interpreter:

1.  If the 'string parameter instability' condition is detected, the 'Incorrect arguments' error (ERR = 31) is reported.

2.  For improved compatibility with BBCSDL, the *DISPLAY and *MDISPLAY commands have been extended to accept an optional 'transparent colour' parameter.

3.  For improved compatibility with BBCSDL, the WIDTH(string$) function is implemented.

IDE / Compiler:

1.  The 'Set Font' and 'Set Printer Font' commands now permit selection of proportional-spaced fonts as well as monospaced fonts (unless disabled by a registry setting).

2.  The Help menu has been updated so as no longer to link to the 'unofficial' BB4W forum, and to include a link to the Facebook page.

3.  When pasting into the editing pane, soft-spaces are converted to hard-spaces.

Libraries:

1.  The D3DLIBA, D3D9LIB and D3D9LIBA libraries are included.

2.  The MULTIWIN library forwards mouse double-click messages to the main window.

3.  The HQSOUND library incorporates PROC_voice() and PROC_stereo() which are functionally similar to the *VOICE and *STEREO commands in BBCSDL.

Add-in Utilities:

1.  A problem causing the Profiler utility to fail if the program contains a *FLOAT command has been fixed.

Example Programs:

1.  New programs 2048.BBC, BUGGY.BBC, DIBLEY.BBC and TRIPLES.BBC have been added to the GAMES directory.

2.  New programs BOUNCE.BBC, SCARAB.BBC and SNOWSCENE.BBC have been added to the GRAPHICS directory.

3.  A new program TOCFUGUE.BBC has been added to the SOUNDS directory.

5th April 2017.