# Context and Timing data

## How do I prevent code checked out from polluting my task context?

When checking out a new project, you must first deactivate the active task. Otherwise all newly created files will become interesting.

## Why do I see strange elapsed times on my Planning tab?

Some platform/jvm combinations can fill with invalid timestamps. This is known to have happened on Mac OSX 10.4 with Java 1.5. See bug 207419. To resolve you can try and manually edit <workspace>/.metadata/.mylyn/contexts/activity.xml.zip.

## Is the backwards compatibility and refactoring of task context handled?

- The Task List and Context Store are compatible across all currently-supported Eclipse versions. This means that you can use the same .mylyn data in both Eclipse 3.x.

- If elements have been renamed they may not appear as interesting when the context is activated.