With SimpleRisk 20170102-001, we converted several of the pages to use javascript AJAX queries against the API functionality. To get SimpleRisk to work properly, you will need to do the following:
For Apache:
1) Enable mod_rewrite by running the comand "a2enmod rewrite".
2) Open the file containing the Apache site configuration. This is likely found under /etc/apache2/sites-enabled.
3) Find the "Directory" section for your simplerisk site and add a line at the top for "AllowOverride all". It should look something like this:
<Directory "/var/www/simplerisk"> AllowOverride all allow from all Options -Indexes </Directory>
4) Restart Apache by running the command "service apache2 restart".
For Nginx:
1) Make sure the HttpRewriteModule is installed.
2) Specify the following inside of the SimpleRisk server configuration:
location ~ /api {
  if (!-e $request_filename) {
    rewrite ^/api/(.*) /api/index.php?__route__=$1 last;
  }
}For IIS:
1) Make sure the URL Rewrite Module is installed.
2) Specify the following inside of the web.config file inside the SimpleRisk web root:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <rule name="epiphany" patternSyntax="Wildcard">
                    <match url="api/*" />
                    <conditions>
                        <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true" />
                        <add input="{REQUEST_FILENAME}" matchType="IsDirectory" negate="true" />
                    </conditions>
                    <action type="Rewrite" url="api\index.php?__route__=/{R:1}" appendQueryString="true" logRewrittenUrl="true" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>