Grants.gov confirms that testing of Adobe’s new versions of Reader are now completed:

Adobe has released Adobe Reader versions 8.1.7 and 9.2. Grants.gov has tested both versions. An issue was identified for Mac PowerPC when using version 8.1.7. When using Mac PowerPC with version 8.1.7 the following message will display “Adobe Reader quit unexpectedly” and then Adobe
Reader suddenly closes the application. This error prevents the user from completing the forms.

No other issues were found and these versions are compatible. If you are currently using a Grants.gov compatible software version it is not necessary to update your software, use of the latest compatible software version is recommended but not necessary. Adobe Reader software updates are released when potential security vulnerabilities are identified. There is limited risk in the usage of Adobe Reader for completion of Grants.gov application packages. To ensure your package is free of viruses, do not accept files from unknown sources.

For more information on compatible software and free downloads visit the Download Software page:
http://www.grants.gov/help/download_software.jsp#adobe811.