Minor correction to known issues text

appinventor/docs/knownIssues.html

@@ -59,26 +59,32 @@
   connections.
 </li>
   
+<p />
+
 <li>Manipulating blocks while switching screens:  If you are working with a multiscreen
 app and you switch screens, do not move blocks with the mouse or click links in the
 Blocks Editor until the new screen is done loading.  If you do so, the Blocks editor
 can become confused about which screen you are working on, and you can get errors, or even
 lose blocks.  The same warning applies when you switch between projects. When loading a new
-project, use the Blocks editor until the project has finished loading.
+project, don't use the Blocks editor until the project has finished loading.
 </li>
 
+<p />
+
 <li>Unstable project loading:
 We've gotten reports of projects loading incorrectly, with blocks missing.   We're trying
 to track this down, but in the meantime be diligent about keeping local backups,
 especially for large and important projects.
 </li>
 
+<p />
+
 <li>Failure to package projects:
 We're currently seeing a 6% failure rate in attempts to package projects.
 Many of these appear to be intermittent.  If your project fails to
 package, try again once or twice.  Another source of failure may
 result from case collisions in the names of media files: If your
-project has two pictures named MyPict.jpj and mypict.jpg, this may cause
+project has two pictures named, for example, MyPict.jpg and mypict.jpg, this may cause
 errors.
 </li>